Fix wording and date range
Fix wording and date range

Made changes to wording of warnings and date range

erose/studentinsights,codeforamerica/somerville-teacher-tool,erose/studentinsights,jamestyack/somerville-teacher-tool,jhilde/studentinsights,jamestyack/somerville-teacher-tool,erose/studentinsights,jhilde/studentinsights,studentinsights/studentinsights,jhilde/studentinsights,hunterowens/somerville-teacher-tool,studentinsights/studentinsights,hunterowens/somerville-teacher-tool,jamestyack/somerville-teacher-tool,jhilde/studentinsights,thfield/somerville-teacher-tool,codeforamerica/somerville-teacher-tool,hunterowens/somerville-teacher-tool,erose/studentinsights,studentinsights/studentinsights,thfield/somerville-teacher-tool,thfield/somerville-teacher-tool,codeforamerica/somerville-teacher-tool,codeforamerica/somerville-teacher-tool,studentinsights/studentinsights